Encryption Management Server Web Email Protection templates include an optional field called Company Name. However, if you populate the Company Name field it does not appear in the Web Email Protection home page.
The content of the Company Name field appears only in the Settings page of Web Email Protection. Once an external user logs into their account and clicks on the Settings menu, they will see it.
If the Company Name field is not populated, the Settings page will show this:
If the Company Name field is populated with Test Company Name, the Settings page will show this: